The Network UPS Tools repository
A suite of Monitoring Plugins (formerly known as nagios-plugins)
Self-hosted, lightweight server and website monitoring and O&M tool
Floating window used to display current network speed, CPU & memory
The Active Monitoring System
A utility to safely generate malicious network traffic patterns
Monitor temperature sensors, fan speed, voltage, load & clock speeds
Lightweight network IP scanner
The core of our monitoring platform
Application to comfortably monitor your Internet traffic
Community-based GPL-licensed network monitoring system
Open-source systems performance monitor
BGP and RPKI monitoring tool
An eye on your system
A simple program to monitor your network/data usage
Open source monitoring system and time series database
The open source time series database
A full packet capturing, indexing, and database system
Apache HertzBeat(incubating) is a real-time monitoring system
pg_activity is a top like application for PostgreSQL server activity
Zeek is a powerful network analysis framework
Performance Co-Pilot
Monitorix is a free, open source, lightweight system monitoring tool
Cross-platform lib for process and system monitoring in Python
Enterprise-Grade Open-Source Network Management Platform